str1="hello"
str2='hello1'
str3="""hello2"""
print(str1)
print(str2)
print(str3)
print('hel\'lo world')
#print('123-----{0}---{1}---{2}'.format(4))
str1 = 'hello'
print(f'123----{str1}')

for i in range(0,101,2):
      print("===========开始下载===========")
      if i == 100:
          print("下载完成")
      else:
         #print(f'{i}%','[',"*"*(i//2),".",']')
         str4 = "*" * (i//2)+"." * ((100 - i)// 2)
         print(f'{i}%[{str4}')
